/Engine/Plugins/Online/OnlineServices/Source/OnlineServicesCommon/Public/Online/AchievementsCommon.h
Event triggered when a player's achievement state changes
virtual [TOnlineEvent](API\Plugins\OnlineServicesInterface\Online\TOnlineEvent)< void(const [FAchievementStateUpdated](API\Plugins\OnlineServicesInterface\Online\FAchievementStateUpdated) &)> OnAchievementStateUpdated()